Skate-sharpener clamp



Y (LRUTSTRl-JM'4 SKATE SHARPENER CLAMP.

APPLICATION FILED APR. I, i920.

Patented June 27, 1922.

Unire E lCEr CALVIN RUTSTRUM, OF MINNEAPOLIS,.MINNESOTA. I

SKATE-SHARPENER CLAMP.

T 0 ZZ whomz' may concern:

Be it known that I, CALVIN RUTSTRUM, a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Skate- Sharpener Clamps, and l do hereby declare the following to be afull, clear, and exact* description of the invention, such as will enable others skilled in the artv to whichV it ap. pertains to make and use the same.

My invention has for its object to providev an extremely simple and highly efficient skate Sharpener clamp for rigidly holding a pair of skates in respect to each other, while simultaneously sharpening' the running edge thereof with a carborundum or other cutting stone. The improved clamp is intended for general use, but is especially adapted for holding so-called tube skates permanently secured to skating shoes, and which shoes afford a` support and clamp for the skates while the skates are being sharpened. j

By the application ofthe improved clamp to a pair of skates, the blades thereof are automatically brought into parallel arrangement in respect to each other in all directions and'with their running edges in the same plane, so that by Yresting a cutting stone on both of said running edges and rubbing the same thereover, the skates may be correctly sharpened. The clamp is portable with'the pair of skates to which it is applied. and is confined entirely between the running edges of the skates and the shoe plates thereof. f

Tothe above end, generallyv stated, the invention consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

In the accompanying drawings, which illustrate the invention, like characters indicate llike parts throughout the several views.

Referring to the drawings Fig. l is a perspective view showing a pair of shoes to which is attached a pair of tube Skates held by my improved clamp, and also showing, by means of broken lines, a cutting stone resting on the running edges of the skates in position to sharpen the same; and

Fig. 2 is a transverse section taken on the line 2 2 of Fig. l and further illustrating a support to which the clamp is secured.

The numeral 3 indicates a pair of so- Specification of Letters Patent. Patented June 27, 1922,

1920. sei-iai No. 370,554..

called tube skates secured to a pair of shoes t, and the numerals 5 and 6 indicate, re'- spectively, a table or other support to which the improved clamp isA attached, and a cutting stone, preferably carborundum, with a coarse side anda vfine side.

The improved clamp includes a bridge member 7 having integrally formed with its longitudinal edges a pair of uptu'rned parvallel fixed jaws 8 and a pair of co-operatingv movable jaws 9 applied to theouter faces of said fixed aws. Both the fixed and movable jaws of each pair have, in their inner faces, longitudinally extended grooves or channels l() arranged to receive the tubular backs of the skates 3, with the blades thereof extending between the upper longitudinal edges of said jaws. The bridge plate 7 is stiffened by transversely creasing or otherwise forming therein reinforcing ribs 7 and it is important to note that said bridge plate is located at a point between the running edges and-shoe plates of the skates.

A pair of thumb-nut-equipped draw-bolts ll is extended through aligned holes in theA jaws 8 and 9 for drawing said movablejawsv 5f-i toward the fixed jaws under a varying pres-V sure. To prevent the fixed jaws 8. from bending or drawing toward each other, un-A derthe action of the 'draw-bolts l1,.there is placed on each of said bolts a sleeve 12, the ends'of which bear against the inner faces of said fixed jaws.

By reference to Fig. 1, it will benoted that the clamp is 'applied to the Vskates be-` tween the cups or standards thereof, and by reference to Fig. 2, it will be noted that each jaw 'of the clamp has a two-point contact with the respective skate, and under the drawing ,action of the bolts l1, the jaws 8* and 9 securely close on the tubular backsof the skates and, by the long engagement therewith, hold'the skates against lateral or twisting movements. As the clamps close on the 'skates, the blades thereof areauto matically positioned so that they are parallel to each other in all directions and with theirl running edges in the same plane. With the skates thus securely held, the cutting stone may be placed on the skate, as shown, first with its coarse side in contact with the running edge thereof, and rubbed back and forth thereon until said blades are in fairly good condition. The sharpening of the blades may be finished by using the fine side of the stone.

ioo

. the support If desired, the clamp may be secured to by means of' a thumb-nutequipped draw-bolt 13 inserted through aligned holes in the bridge member 7 and said support, as shown in Fig. 5. Obviously,

bv loosening the thumb nuts on the draw-Y pressed metal bridge plate having at its longitudinal edges integrally formed fixed jaws, a pair of* movable jaws, said fixed and movable .jaws .having co-operating semi-cylindrical seats each constructed and arranged 1 to. engage-thetubes of tube skates at two circumferentially spaced points, and nutequipped draw bolts for drawing the movable jaws toward the fixed jaws.

2. A skate Sharpener clamp comprising a pressed. metal bridge plate having its longitudinal ledge.y portions bent into parallel arrangementv to afford a pair of fixed clamps having semi-cylindrical awportions, movable jaws outward of the fixed jaws for cooperation therewith, said jaws being constructed and arranged to engage the tubes of tube skates at two circumferentially spacedl points, and a pair of nut-equipped bolts extending through apertures in the fixed and movablefjaws between the bridge plate and their semi-cylindrical,portions for drawing the movable aws toward the fixed jaws.

V3. A skate clamp adapted to be disposed between the heel and toe supports of a pair of tube skates comprising a base member and a pair of-j aws upstanding at each side thereof, oneY of the f jaws yof each pair being fixed relativeV to said member, the other jaw of eachA pair being' movable in relation thereto,

- the said jaws being of semi-cylindricalA formation and adapted to embrace the tube of saidskates and engage therewith at circumferentially spacedpoints, whereby the said tube and skate can be adjusted angularly in said jaw so that the runner face thereof may be finished on a bevel.-

4i. A support adapted to'hold a pair of' skates for sharpening comprising a base plate member of much shorter` length than the skate runners, said base plate member being bent upwardly at each side thereof toa form fixed jaws rigid therewith, a movable jaw mounted for co-operation with each` of said fixed jaws, means for closing and holding said jaws in clamping position, said jaws being constructed and arranged to continuously engage the sides of the skate runners at a relatively short portionnear the center thereof between the heel and toe supports thereon.

5. A support for holding a pair of skates for sharpening, comprising a pair of spaced jaws, each of saidjaws being of semi-circular shape in cross section and constructed and arranged to clamp the tube of tube skates at circumferentially spaced points.

6. A support for holding a pair of skates in position for sharpening comprising a base plate member, said member being bent upwardly at each side to form a terminal movable semi-cylindrical fixed jaw, a movable semi-cylindrical jaw arranged Jfor co-operation with each of said fixed jaws, spaced bracing members extending between the upwardly bent portions of the plate which form the fixed jaws, said aws being Vadapted to continuously engage the skaterunners forA a considerable distance between the heel and toe supports thereof, said base member and said jaws being` of the same length.

7. A support for holding a pair of skates in position for sharpening comprising a plate base member adapted to be vrdisposed between. the heel and toe supports of the`r skate runners, jaws extending upwardly from the sides of said plate, movable ljaws arranged to co-operate therewith, headed bolts extending across said plate through said jaw portions, tightening nuts vat one end of said bolts and spaced tubular members extending above said plate between the fixed jaws in which said bolts are disposed.

lin testimony whereof I afiix my'signature in presence of two witnesses CALVIN RUTSTRUM.

ibn s W f e ses WINIFRED I. WARD, HARRY D. KILGORE. 

